package com.tanhua.server.interceptor;

import cn.hutool.core.util.StrUtil;
import com.tanhua.common.pojo.User;
import com.tanhua.common.utils.NoAuthorization;
import com.tanhua.common.utils.UserThreadLocal;
import com.tanhua.server.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class UserTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 校验handler是否是HandlerMethod
        if (! (handler instanceof HandlerMethod)){
            return true;
        }

        // 判断是否包含@NoAuthorization注解,如果包含直接放行
        if (((HandlerMethod) handler).hasMethodAnnotation(NoAuthorization.class)){
            return true;
        }

        // 从请求头获取token
        String token = request.getHeader("Authorization");
        if (!StrUtil.isEmpty(token)){
            User user = this.userService.queryUserByToken(token);
            if (user != null){
                // token 有效
                // 将user对象放到ThreadLocal中
                UserThreadLocal.set(user);
                return true;
            }
        }

        System.out.println("UserTokenInterceptor 中token无效");
        // token 无效 则响应401
        response.setStatus(401);
        return false;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 从ThreadLocal中移除User对象
        UserThreadLocal.remove();
    }
}
